Brooks' newest and lightest shoe, the PureDrift ($100; available January 2013 at BrooksRunning.com), feels more like a second skin than a sneaker. Backed by running biomechanics research, every pair comes with a removable insole to allow every runner to customize his or her experience. Other high-tech features include a dual toe box split for better balance and a springy push-off and a sleek, anatomical upper with ultra-breathable mesh and featherweight feel.